Consider also, how and where shall you use navigation. On normal streets and routes Nuvis and Zumos would work fine. (or soon even all pone-navigators). If you need any off-road features, you should look at Montana. Garmin like all other manufacturers focus on cars driving in cities and main roads. That is where the big market is. Turn-by-turn voice navigation, traffic info, online tips and tricks... This is what all are offering. If you want go out from the main streets and even on off-road, you possibilities to select a good navigator is very narrow. Features like off-road tracks, good track management, going on waters... you need Montana.